Electrical signaling system.



A. GOLDSTEIN.

BLEGTRI'GAL SIGNALING SYSTEM. AYPLIOATION FILED 1.13.9, 1910- 966,824.Patented Aug. 9, "1910.

0 6 I L a INVENTOH my M v v I v fi nnonurr WiT/IESSES:

UNITED STATES PATENT diaries,

ALBERT GOLDSTEIN, OF NEW YORK, N. Y., ASSIGNOR T INTERNATIONAL ELECTRICPROTECTION COMPANY, A CORPORATION OF NEW YORK.

ELECTRICAL SIGNALING SYSTEM. I

Specification of Letters Patent.

Patented Aug. 9, 191th To a-ll whom 'it may concern:

Be it known that I, ALBERT GoLnsTEiN, a citizen of the United States,residing at New York, in the county of New York and State of New York,have invented a certain new and useful Improvement in ElectricalSignaling Systems, of which the following is a specification.

The invention is acentral energy electrical signaling system, in whichsuccessive code signals may continue to be sent from a plurality oftransmitters, notwithstanding an abnormal disturbance-such as a break inthe eleptrical conditions of the circuit, and in which the transmittersare timed and their operation .rendered successive by electrical means!the said means here co1nprising thermostatic switches heated and so controlled by the current on the circuit.

In the accompanying drawing Figure 1 is an electrical diagram, showingmy invention by conventional symbols. Fig. 2 is a side elevation of oneof the thermostatic switches.

Similar numbers and letters of reference indicate like parts.

Located at the receiving station is a source A of current, here shown asa split battery, which is grounded at G. At three distant stations arethe transmitters T, T, T the 'line conductor between the stations beingshown at- 1 and 25. At the receiving station are the magnets D, Erespectively interposed in lineconductors 1, and each controlling alocal circuit from battery L to the glow lamps P, Q, so that when eithermagnet vibrates its switch lever 07 or e to open or' close its localcircuit, the signals will be translated by said lamps.

The metallic circuit proceeds as follows: From source A to magnet D,line wire 1, to transmitter T and therein to contact 2, heat switch armS wire 3, switch n contact l, wire 5, switch 0, contact. 6, wire 7, heatswitch arm S contact 8 and thence by wire 9, to transmitter T, andtherein to contact 10, heat switcharm S, wire 11, switch a, contact 12,wire 13, switch 0, contact 14-, wire 15, heat switch arm S, contact 16and thence by wire 17 to transmitter T and therein to contact 18, heatswitch arm S wire 19, switch a, contact 20, wire 21, switch 0 contact22, wire 23, heat switch arm S", contact 24 to fline wire 25, magnet.Eto source A, i

. as before.

with code wheel M, the detent it again 811- gages with said notch. Thesame result is produced through magnets WV", W of trans mitter T, andthrough magnets W*, 'W of transmitter T In order that the transmittersT, T, T may send in their signals successively, no matter inwhat orderthey may be operated, or whether. theybe operated simultaneously orotherwise, the following construction is provided: Magnet W .is inashunt having terminals at contact point 8, and junction w. Magnet W isin a shunt having terminals at contact point 2, and junction y. Undernormal conditions, as already described, contacts 8 and 2 are closed andmagnets V and W are short-circuited, and accordingly 'deenergized. Thehinged armature to then being retracted, the pallet tail 6 is locked,and the detent h engages in the notch of winding drum 2'. When, however,the lever o is depressed, circuit being opened at point 6 proceeds asfollows: from wire 1 to contact 2, heat switch arm S coil on said arm,wire 28, wire 29, contact 30, switch n, con- .tact 31, switch n wire 32,coil of heat switch S heat switch arm 8, contact 8 and wire 9, The coilson heat switch arms S S now become heated by the current, thus producingunequal expansion of the thermostatic arms within them, and causing saidarms to bend sufiiciently to open cir' cuit at contacts 2 and 8. rent topa ss to the magnet shunts, thus energizing magnets W, \V and, causingin the manner already described, the release of code wheel M which,rotating in the usual way, sends signals over the line.

It is to be observed that code wheel .M

This enables cursends impulses by intermittently closing the'i 10 as forexample, first, in transmitter T, sec-.

net W to junction 3 coil of heat switch S I contact 14, switch 0, wire13, contact 12,

wire 28, wire 29, contact 30,, switch 71., contact 31, switch n wire 32,coil of heat switch S junction 02, magnet W to wire 9.

On the shaft of wheelM is a cam N having an insulating ring on itsperiphery. On this ring the bent over end of switch arm n bears whilesaid wheel and cam are in rotation. In this way the arm a is raisedtogether with arms a, 91 ,713, which are connected to arm n byintermediate bars of insulating material, thus opening circuit atcontacts 30, 31 and 1, and closing circuit to ground G at contact 34:.When this is done the code wheel M controls the circuit to ground G, byoperating switch arms m, m, connected by a bar of insulating material,to open and close contacts 35. and 36 which, by wire 37, contact 34 andswitch it, connect to ground G.

In order to prevent a premature restoring of switch 0 to its originalposition, closing a. short-circuit by wires 5 and 7 around thetransmitter T, the switch 12. is provided, which-opens contact 4 inseries with wire 5. I The construction of transmitters T and T is thesame as that of transmitter T, with which they are connected in seriesin the metallic circuit. The heat switches S S of transmitters T, S S oftransmitter T and S S of transmitter T are to be eon-.

structed so that the switch arms in each transmitter will operate at adifferent time 0nd, in transmitter T and third, in trans-' Initter T-when their coils areheated simultaneously. This maybe accomplished in avariety of known ways, as by proper tioning the resistances of thecoils, or the cross sectional area or by selection of materials of thethermostatic elements, or by varying the normal pressures of thecontacts-as 2 and 8in the several transmitters against the arms.

Assume now that the transmitter T be operated, the transmitters T, Twill not operate, because thelow resistance circuit to ground G is onlyclosed momentarily by switch m, and current then does not pass for alongenough period of time to the coils of-the heat switches of transmittersT, T

to operate said switches.

So far I have described the operation of the system on normal circuit. Iwill now assume that a disturbance occurs in the electrical conditionson the line, say a break. If said break, say at Z, occurs on wire 1,then there will be two leads formed from th source A: namely (1) tomagnet D, wire 1 to break; and (2) to ma et E,v

wire 25, contact 24, heat switch arm wire 23, contact 22, switcho wire21, contact 20, switch it, wire19, heat switch arm S 'contact18, bywire17 to transmitter T and therein contact 16,; switch arm S, wire 15,

: disturbance of electr switch it, wire 11, heat switch arm S conhand,the break occurs in wire 25, say at Z,

again there will be two leadsformed from source A: namely (1) to magnetD, wire 1 and so through the transmitters T, T, T but in the reversedirection to the second lead above "described, to break Z; and (2) tomagnet E, wire 25 to break Z. It will be obvious that in either case, inorder to operate any one of the transmitters, a ground must be providedat that transmitter. I will assume that the break is in wire 25- at Z,and that it is desired to, operate transmitter T. The. switch 0 isopenedat contact 6, as already described, but because of the breaknothing can happen unless a current path to ground is established. ThisI do by the following means. Connected to switch 0 by a-bar ofinsulating material is a switch 1 which conmeets with wire 1 by way ofwire 45, switch 11/, contact 30, wire 29, wire 28, coil of heat switch,heat switch arm S and contact 2. .In the path of switch p is a contact47 which connects with ground G" through the coil of heat switch S.Hence when switch 0 opens circuit at contact 6, it closes circuit at 47and so connects wire 1 with ground.

The coil of heat switch S is made of very high resistance as compared tothe coil of heat switch S -say 20,000 ohms to 20 ohms-so that althoughthe two coils are in series,S*- only is heated. When heated, thethermostatic arm inclosed' in said coil establishes contact with point44 which is connected with the coil of Sf? This short-dry cuits thegreater part .of v the resistance offered by said coil, so that theincreased current now passing through the coil of S is suflicient toheat the switch arm therein and cause said arm to open the shunt aroundmagnet W at point 2, thus energizing said magnet and setting the codewheel M in operation in the manner already described. The reason formaking the coil of heat switch S of very high resistance is to preventsignals sent from the other transmitters from being cut ofi' from thereceiving station, as would happen if the ground provided fortransmitter .T were of low resistance.

I claim:

1. The combination of a source of current, a metallic circuit, aplurality of transmitters in series therein, a plurality of translatingdevices controlled by said transmitters, means 'oper d by an abnormalInfidel conditions on the -mitters to operate successively.

2. The combination of a source of current, a metallic circuit, aplurality of transmitters in-series therein, a plurality of trans lane};devices controlled by said transmitters, meansoperatedby an abnomnal disturbance of electrical conditions onthe circuit for establishing twocurrent leads,

one of said leads including a translating device and two or moretransmitters,- means forcontrolling said included transmitters to,operate successively, and means for preventin'g mutant interference. ofthecurrent inn pulses respectively sent. by said transmitters.

3. The combination of a source of current, a metallic circuit, aplurality of transmittors in, series therein, thermostatic circuitclosers associated with each transmitter and controlling the same, thesaid thermostatic circuit, closers being relatively timed to cause saidtransmitters to operate successively, and translating devices controlledby said transmitters. a

In testimony whereof I have affixed my signature in presence of twowitnesses.

' c ALBERT GOLDSTEIN.

Witnesses; t

GERTRUDE T. P01111212, MAY T. .MCGARRY.

